These are probably the most durable dumbbells I have ever owned. While the rubber ones provide more comfort while working out, those don't usually last as long, especially if they're constantly exposed to sweat and humidity. These are great; I can store them anywhere around the house, and they hold up great. I've had mine for about 10 years. The only suggestion I can give is to use workout gloves when using this, otherwise it's very likely you'll develop calluses.